Adaptive Modulation and Coding Schemes Based on LDPC Codes with Irregular Modulation

Ahn, Seok-Ki; Yang, Kyeongcheol

doi:10.1109/tcomm.2010.080310.090176

Cited by 25 publications

(10 citation statements)

References 16 publications

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“…To prove Proposition 1(i), we first show that the achievable rate R(H, Q) can be asymptotically characterized by C MT and Q regardless of channel realization H. Combining (38) and (39), we obtain (37). With Remark 1, we can obtain an upper bound for the full CSIT capacity as detailed below.…”

Section: A Proof Of Propositionmentioning

confidence: 96%

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Transmitter Design for Uplink MIMO Systems With Antenna Correlation

Wang

Zhang

et al. 2015

IEEE Trans. Wireless Commun.

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We study the uplink transmission in multiple-input multiple-output (MIMO) systems with antenna correlation. We focus on schemes that require only channel covariance information at the transmitter (CCIT), which involves lower cost than full channel state information at the transmitter (CSIT). We start from mutual information analysis and show that a simple CCIT-based scheme, referred to as statistical water-filling (SWF), can perform close to the optimal full CSIT-based one in MIMO systems with more receive antennas than transmit ones. We then focus on the implementation of SWF in practically coded systems. An iterative linear minimum mean squared error (LMMSE) receiver is assumed and an extrinsic information transfer (EXIT) chart type curve matching technique is developed based onHadamard precoding techniques. Simulation results show that the proposed scheme can obtain significant performance improvement compared to the conventional equal power transmission. Finally, we show that the proposed scheme is also very efficient in multi-user uplink MIMO systems with distributed channel information. Index Terms-Uplink MIMO, antenna correlation, channel covariance information.1536-1276 (c) (S'05-M'10) received the B. Eng. degree in telecommunication engineering and the M. Eng. degree in information engineering, from Xidian University,

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Section: A Proof Of Propositionmentioning

confidence: 96%

“…In a MIMO channel with antenna correlation, information rates should be carefully allocated to different channel eigen-directions. Adaptive modulation is a standard approach for this purpose [37], [38]. Denote the number of bits carried by the symbol on the n-th eigen-direction by Q n , and its average over all eigen-directions byQ.…”

Section: Introductionmentioning

confidence: 99%

Transmitter Design for Uplink MIMO Systems With Antenna Correlation

Wang

Zhang

et al. 2015

IEEE Trans. Wireless Commun.

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“…At the transmitter, it requires N 2 c multiplications per OFDM symbol as shown in (3). At the receiver, in addition to the matrix operation for despreading, MMSEC is applied to compensate for collapse of orthogonality due to frequency selective fading, and it requires 2 × N c multiplications according to (9) and (10). Thus computational complexity by FSS totally increases by 2N c (N c +1) per OFDM symbol.…”

Section: Throughput Performance Evaluationmentioning

confidence: 99%

Throughput Maximization by Adaptive Switching with Modulation Coding Scheme and Frequency Symbol Spreading

Kojima

Maruta

Ahn

2018

JCOMSS

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This paper proposes a novel adaptive control method that maximizes throughput by optimally switching adaptive modulation and coding (AMC) and frequency symbol spreading (FSS). AMC has been extensively studied and is widely adopted as a method for optimizing throughput in fluctuating channels caused by shadowing, multipath fading and mobility. By applying AMC, communication performance can be effectively improved for varying channels. Forward error correction (FEC) is also used as communication quality improvement method. FEC is effective to improve throughput performance especially in a low SNR region. However, it has sacrificed the maximum throughput in the case of the good channel situation. FSS has been proposed as a method for suppressing the influence of frequency selective fading without degrading the maximum throughput by dispersing subcarrier symbol to all frequency components. FSS can obtain large frequency diversity gain by its diffusibility. From the simulation results, we confirm the effectiveness of the proposed method from the viewpoint of maximizing throughput.

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“…Low Density Parity Check is a channel coding that adds redundancy bits used for error detection and correction (Ahn and Yang, 2010). Gallager (1962) invented the LowDensity Parity Check Code (LDPC) that achieves the target of a random but systematic code, enabling near Shannonlimit performance.…”

Section: Orthogonal Frequency Division Multiplexing and Low Density Pmentioning

confidence: 99%

Wirelesshd Video Transmission Over Multicarrier Error-Correctionchannels

Khedr¹,

Sharkas²

2012

Journal of Computer Science

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Uncompressed High-Definition video streaming over extremely high frequency using wireless technologies, also known as WirelessHD, is a challenge problem because of the high data rate requirement and channel variations. The advantages in RF technology and the huge bandwidth available in the 57-66 GHZ millimeter wave open new era for High Definition applications and high data rates communication. Retransmission is not favored for HD multimedia transmission as any latency may cause flickering. So, powerful error correction and detection is needed to detect any corrupted pixels and recover it to guarantee the communication. In this study, we proposed a system that uses Low Density Parity Check (LDPC) code for error detection and correction and OFDM technique for protecting video signal from fading. A suggested frame partitioning technique is applied to perform spatial diversity.To judge on the proposed system, peak signal to noise ratio and symbol error rate will be used at the receiver for testing the received frame quality. Simulations using uncompressed videos indicate that the proposed system can give low bit error rate and high peak signal to noise ratio after transmitting the frame over AWGN and Rayleigh channels.

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Adaptive Modulation and Coding Schemes Based on LDPC Codes with Irregular Modulation

Cited by 25 publications

References 16 publications

Transmitter Design for Uplink MIMO Systems With Antenna Correlation

Transmitter Design for Uplink MIMO Systems With Antenna Correlation

Throughput Maximization by Adaptive Switching with Modulation Coding Scheme and Frequency Symbol Spreading

Wirelesshd Video Transmission Over Multicarrier Error-Correctionchannels

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